<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>天气案例</title>
    <script type="text/javascript" src="../../vue.js/vue.js"></script>
  </head>

  <body>
    <div id="root">
      <h2>今天天气很{{info}}</h2>
      <!-- 绑定事件的时候:@xxx="yyy" yyy可以写一些简单的语句 -->
      <button @click="isHot = !isHot">切换天气1</button>
      <button @click="changeWeather">切换天气2</button>
    </div>

    <script type="text/javascript">
      Vue.config.productionTip = false;

      const vm = new Vue({
        el: "#root",
        data: {
          isHot: true,
        },
        computed: {
          info() {
            return this.isHot ? "炎热" : "凉爽";
          },
        },
        methods: {
          changeWeather() {
            this.isHot = !this.isHot;
          },
        },
      });
    </script>
  </body>
</html>
